The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for current assets (assets with expected useful life shorter than one year or one operating cycle, whichever is longer) of a disposal group, including a component of the entity (discontinued operation), to be sold or that has subsequently been disposed of through sale, as of the financial statement date.

Name:	us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 26, 2014	Jan. 27, 2013	Jan. 26, 2014	Jan. 27, 2013	Jul. 28, 2013	Jul. 29, 2012
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 0	$ 171	$ 137	$ 302
Earnings before taxes	0	24	14	41
Taxes on earnings	0	5	5	9
Gain on sale of business	147	0	141	0
Tax impact of gain on sale	57	0	69	0
Earnings from discontinued operations	90	19	81	32
Cash	0	0	0	0	68	0
Accounts receivable					54
Inventories					68
Prepaid expense					3
Current assets of discontinued operations held for sale	0		0		193
Plant assets					98
Goodwill					110
Intangible assets					150
Other assets					35
Non-current assets of discontinued operations held for sale	0		0		393
Accounts payable					60
Accrued liabilities					54
Current liabilties of discontinued operations held for sale	0		0		114
Non-current pension obligation					11
Other liabilities					11
Non-current liabilities of discontinued operations held for sale	$ 0		$ 0		$ 22